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Saturday, April 13, 2013

Datsun (Nissan) 620 1974 Brake Repair Guide

DESCRIPTION

Brake system is hydraulically operated, using a tandem master cylinder and a Master-Vac power brake unit. Leading-trailing shoe/drum brakes are used on all four wheels, with front brakes actuated by uni-servo wheel cylinder, and rear brakes actuated by a duo-servo wheel cylinder. Parking brake is cable actuated, operating secondary shoes of rear brake assemblies.

ADJUSTMENT

BRAKE PEDAL

Loosen stop light switch adjusting nuts and rotate switch until pedal, height, measured from pedal to floor, is approximately 5.5". With pedal height adjusted, adjust brake pedal push rod adjusting nut so that .039 - .118" free play is obtained, when depressing pedal. With pedal assembly properly adjusted, total pedal travel should be 4.96 - 5.20" with no interference.

BRAKE SHOES

Remove rubber boot from hole in front backing plate and lightly tap adjuster housing to move it forward. Using a suitable brake adjusting tool, turn adjuster downward until drum locks, then back off until drum is free to rotate. Adjustment procedure for rear brakes is the same, with parking brake fully released.

Attach a bleed tube to wheel cylinder bleeder screw, and immerse opposite end into a container partially filled with brake fluid. Pump brake pedal two or three times, open bleeder screw to allow air to escape, then close bleeder screw. Continue operation until air is no longer seen in discharged fluid. Repeat procedure on remaining brake lines. Bleed rear wheel first, front wheel last.

Cleaning & Inspection - Clean all parts in clean alcohol or brake fluid. NOTE - DO NOT use mineral based solvents. Inspect all parts for wear or damage; replace parts as necessary. Check clearance between piston and cylinder bore; if clearance exceeds .006", replace cylinder or piston as necessary.